Characterization of electrostatic gap-closing actuator arrays in aqueous conditions

2018 ◽  
Author(s):  
Ryan M. Shih ◽  
Daniel S. Contreras ◽  
Travis L. Massey ◽  
Joseph T. Greenspun ◽  
Kristofer S. J. Pister
Keyword(s):  
Actuator Arrays ◽  
Aqueous Conditions ◽  
Gap Closing

Abrasion Under Humide Condition for Tool Steels H-13 and AISI D-2

Tribology ◽  
2006 ◽  
Author(s):  
I. Hilerio ◽  
M. Vite ◽  
M. A. Barro´n ◽  
H. Jime´nez ◽  
G. D. Alva´rez
Keyword(s):  
Wear Resistance ◽  
Mining Industry ◽  
Wear Test ◽  
Aqueous Environment ◽  
Aqueous Environments ◽  
Ionic Process ◽  
New Material ◽  
Aqueous Conditions ◽  
Wear Tool

In the present work, is developed the tribologic characterization of steels AISI H-13 and D-2, submitted to nitruration ionic process to determine wear resistance in aqueous conditions. Wear test are realized with an abrasion wear tool in an aqueous environment, designed and constructed by SEPI, ESIME, IPN, according to the norm ASTM G105-89. The aim of this investigation is to use a new material at lower prize which has an excellent wear resistance properties for high abrasion in aqueous environments, as occurs in several cases as mining industry equipments.

Electrocatalytic reduction of dioxygen by Mn(iii) meso-tetra(N-methylpyridinium-4-yl)porphyrin in universal buffer

2019 ◽  
Vol 48 (24) ◽  
pp. 8633-8641 ◽  
Author(s):  
Lauren E. Lieske ◽  
Shelby L. Hooe ◽  
Asa W. Nichols ◽  
Charles W. Machan
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Characterization ◽  
Electrocatalytic Reduction ◽  
Universal Buffer ◽  
Aqueous Conditions

The electrochemical characterization of manganese(iii) meso-tetra(N-methylpyridinium-4-yl)porphyrin pentachloride via cyclic voltammetry (CV) and UV-vis spectroelectrochemistry (UV-vis SEC) was performed to examine O2 reduction in aqueous conditions.

Preparation and characterization of collagen/chitosan/hyaluronic acid thin films for application in hair care cosmetics

2017 ◽  
Vol 89 (12) ◽  
pp. 1829-1839 ◽  
Author(s):  
Alina Sionkowska ◽  
Beata Kaczmarek ◽  
Marta Michalska ◽  
Katarzyna Lewandowska ◽  
Sylwia Grabska
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Hyaluronic Acid ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Mechanical Resistance ◽  
Hair Care ◽  
Hyaluronic Acids ◽  
Aqueous Conditions

AbstractIn this study thin films based on a blend of collagen, chitosan and hyaluronic acids were prepared and their surface and mechanical properties were studied. The structure of the films was studied using FTIR spectroscopy, contact angle measurement and AFM images. Swelling and mechanical analyses were also performed. The hair protection possibility of collagen/chitosan/hyaluronic was studied using SEM microscopy and the mechanical testing of hair coated by the blends. It was found that the addition of hyaluronic acid to a collagen/chitosan blend improves the mechanical resistance of biopolymeric films. Samples with the addition of hyaluronic acid were more stable in aqueous conditions and provided higher roughness of surface.

Mesoporous Silica and Titania by Glycol-Modified Precursors

2007 ◽  
Vol 1007 ◽  
Author(s):  
Jasmin Geserick ◽  
Nicola Hüsing ◽  
Renate Roßmanith ◽  
Clemens K. Weiss ◽  
Katharina Landfester ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Sol Gel ◽  
Oxidation Reactions ◽  
Low Temperature Co Oxidation ◽  
Catalytic Applications ◽  
Aqueous Conditions ◽  
Gel Processing ◽  
Silica And Titania

ABSTRACTEthylene glycol modified precursors, such as tetrakis(2-hydroxyethyl)orthosilicate (EGMS) or bis(2-hydroxyethyl)titanate (EGMT), have distinct advantages in the synthesis of mesoporous materials by sol-gel processing compared to the commercially available tetraalkoxide precursors. The glycols released upon hydrolysis have proven to be compatible with lyotropic surfactant mesophases and in addition, these precursors allow for processing in purely aqueous conditions. Besides the standard characterization of the resulting titania and silica-based materials by XRD, electron microscopy, and nitrogen sorption, the potential of the titania-based materials for catalytic applications was tested using Au/TiO2 catalysts in low temperature CO oxidation reactions.

Fabrication and Characterization of a Balloon Actuator Array for Haptic Feedback in Robotic Surgery

2008 ◽  
Vol 2 (4) ◽  
Author(s):  
Chih-Hung King ◽  
Miguel Franco ◽  
Martin O. Culjat ◽  
Adrienne T. Higa ◽  
James W. Bisley ◽  
...  
Keyword(s):  
Robotic Surgery ◽  
High Performance ◽  
Visual Cues ◽  
Sensory Input ◽  
Haptic Feedback ◽  
Inflation Pressure ◽  
Actuator Arrays ◽  
Compact Size ◽  
And Performance

Robot-assisted surgery is characterized by a total loss of haptic feedback, requiring surgeons to rely solely on visual cues. A pneumatically-driven balloon actuator array, suitable for mounting on robotic surgical master controls, has been developed to provide haptic feedback to surgeons. The actuator arrays consist of a molded polydimethylsiloxane substrate with cylindrical channels and a spin-coated silicone film that forms the array of balloons. Preliminary human perceptual studies have demonstrated that balloon diameters greater than 1.0mm may provide effective haptic feedback to the index finger. Before conducting further human perceptual tests, refinements of the fabrication process and performance data of the actuator are required. Balloons with diameters ranging between 1.5mm and 4.0mm were fabricated with film thicknesses of 200μm and 300μm. Inflation pressure versus balloon deflection tests and cyclic actuation tests were performed to characterize each balloon type. The results demonstrated a high linearity between inflation pressure and balloon deflection (R2>0.93) and negligible hysteresis effects between inflation and deflation over 100,000cycles. The studies indicated that 300μm films are optimal for 3.0mm and 4.0mm diameter balloons, and 200μm films are optimal for 1.5mm, 2.0mm, and 2.5mm diameter balloons. Due to its compact size and high performance, the described pneumatic actuator can provide sensory input that is otherwise unavailable during robotic surgery.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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